# We are learning to use the for

We are learning to use the formula:

P(A or B)=P(A)+P(B)-P(A and B)

Now, the question is: Using data from a table listing drive-thru order accuracy at four different restaurants, if one order is randomly selected, find probability of getting an order from retaurant A or D or an order that is not accurate.

A            B           C            D

Order Accurate             330        267        231        131

Order NOT Accurate      31          58          34          20

* I tried watching a solve from the professors video and she was adding the total # of errors from all restaurants + Errors from Restaurant A + Errors from Restaurant D/grand total of all transactions. So, I tried the identical solve and came up with a wrong answer.

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